Delete Trackpoint_380.ino
This commit is contained in:
Frank Adams
GitHub
parent
bedd33a1ae
commit
d5f5ca3944
1 changed files with 0 additions and 127 deletions
|
|
@ -1,127 +0,0 @@
|
|||
/* Copyright 2020 Frank Adams
|
||||
Licensed under the Apache License, Version 2.0 (the "License");
|
||||
you may not use this file except in compliance with the License.
|
||||
You may obtain a copy of the License at
|
||||
http://www.apache.org/licenses/LICENSE-2.0
|
||||
Unless required by applicable law or agreed to in writing, software
|
||||
distributed under the License is distributed on an "AS IS" BASIS,
|
||||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
See the License for the specific language governing permissions and
|
||||
limitations under the License.
|
||||
*/
|
||||
// This software interfaces the Teensy 3.2 with a Thinkpad 380ED laptop trackpoint.
|
||||
// The trackpoint strain gauge resistors are fed to an instrumentation amplifier which drives the
|
||||
// Teensy ADC inputs.
|
||||
// In the Arduino IDE, select Tools, Teensy 3.2. Also under Tools, select Keyboard+Mouse+Joystick
|
||||
//
|
||||
// Revision History
|
||||
// Rev 1.0 - April 22, 2020 - Original Release
|
||||
// Rev 1.1 - May 15, 2020 - Now using OSH Park PCB. Swapped A10 & A11. Added left & right mouse buttons.
|
||||
//
|
||||
// Defines
|
||||
#define TP_LEFT 20 // Trackpoint mouse buttons connected to Teensy 3.2 I/O's
|
||||
#define TP_RIGHT 5
|
||||
#define TP_RETURN 30
|
||||
// declare and initialize variables
|
||||
int x_read; // stores the reading from the X ADC
|
||||
int y_read; // same for the Y ADC
|
||||
char mx; // signed byte used by the Mouse.move function for x value. Positive value moves to the right
|
||||
char my; // positive y value moves down
|
||||
int x_delta; // signed 16 bit value gives x movement amount
|
||||
int y_delta; // y version.
|
||||
int x_center; //resting position of x sensor
|
||||
int y_center; //resting position of y sensor
|
||||
int noise_zone = 50; // dead zone around the center. Can be as low as 3 but cursor may start to drift so add some safety margin.
|
||||
// Increase this number if the cursor moves without touching the TP. Decrease if too much force is needed.
|
||||
//
|
||||
boolean left_button = 0; // on/off variable for left button, 1 = pushed
|
||||
boolean right_button = 0; // on/off variable for right button, 1 = pushed
|
||||
boolean old_left_button = 0; // on/off variable for left button from the previous cycle
|
||||
boolean old_right_button = 0; // on/off variable for right button from the previous cycle
|
||||
boolean button_change = 0; // Shows when the left or right buttons have changed, 1 = change
|
||||
//
|
||||
// Function to set a pin as an input with a pullup
|
||||
void go_pu(int pin)
|
||||
{
|
||||
pinMode(pin, INPUT_PULLUP);
|
||||
digitalWrite(pin, HIGH);
|
||||
}
|
||||
// Function to send a pin to a logic low
|
||||
void go_0(int pin)
|
||||
{
|
||||
pinMode(pin, OUTPUT);
|
||||
digitalWrite(pin, LOW);
|
||||
}
|
||||
//
|
||||
|
||||
void setup()
|
||||
{
|
||||
delay(1000); // delay a second to let things settle out
|
||||
analogReadRes(13); // set ADC resolution to 13 bits (16 bit ADC but low 3 bits are random noise)
|
||||
analogReadAveraging(8); // ADC will take the average of 8 reads to filter noise.
|
||||
x_center = analogRead(A11); // store the center (no movement) position for x
|
||||
y_center = analogRead(A10); // same for y
|
||||
//
|
||||
go_0(TP_RETURN); // send the buttons return pin low always
|
||||
go_pu(TP_RIGHT); // set right trackpoint button as input with a pullup
|
||||
go_pu(TP_LEFT); // set left trackpoint button as input with a pullup
|
||||
// When the keyboard code is added, detect when Fn - F8 is pushed to indicate that
|
||||
// x_center and y_center should be read again from the ADC. This would be because
|
||||
// the operator notices the cursor is moving without being pushed.
|
||||
}
|
||||
//
|
||||
// ************************************Main Loop***************************************************************
|
||||
void loop() {
|
||||
mx = 0; // for each loop, start with zero and update only if movement detected
|
||||
my = 0; // same for y
|
||||
|
||||
x_read = analogRead(A11); // read the ADC tied to the X sensor
|
||||
if (x_read > (x_center + noise_zone)) { // is ADC to the right of the noise zone beyond the resting position?
|
||||
x_delta = (x_read - (x_center + noise_zone)) / 10; // find out how far beyond noise zone. Divide by 10 to slow it down.
|
||||
mx = byte(x_delta); // convert signed 16 bit to signed 8 bit
|
||||
}
|
||||
else if (x_read < (x_center - noise_zone)) { // is ADC to the left of the noise zone beyond the resting position?
|
||||
x_delta = (((x_center - noise_zone) - x_read) / 10) * -1; // Answer should be negative so multiply by -1
|
||||
mx = byte(x_delta);
|
||||
}
|
||||
|
||||
y_read = analogRead(A10); // read the ADC tied to the Y sensor
|
||||
if (y_read > (y_center + noise_zone)) {
|
||||
y_delta = ((y_read - (y_center + noise_zone)) / 10) * -1; // up movement is negative for Mouse.move function
|
||||
my = byte(y_delta);
|
||||
}
|
||||
else if (y_read < (y_center - noise_zone)) {
|
||||
y_delta = (((y_center - noise_zone) - y_read) / 10);
|
||||
my = byte(y_delta);
|
||||
}
|
||||
|
||||
// send the x and y data over usb if either one is not at center position
|
||||
if ((mx != 0x00) || (my != 0x00)) {
|
||||
Mouse.move(mx,my);
|
||||
}
|
||||
// ***********************read the touchpad left and right buttons***********************************
|
||||
if (!digitalRead(TP_RIGHT)) { // check if right button is low (low = pushed)
|
||||
right_button = 1; // save state of button
|
||||
}
|
||||
else { // clear right button
|
||||
right_button = 0; // save state of button
|
||||
}
|
||||
if (!digitalRead(TP_LEFT)) { // check if left button is low (low = pushed)
|
||||
left_button = 1; // save state of button
|
||||
}
|
||||
else { // clear left button
|
||||
left_button = 0; // save state of button
|
||||
}
|
||||
// Determine if the left or right mouse buttons have changed (using XOR) since the last cycle
|
||||
button_change = (left_button ^ old_left_button) | (right_button ^ old_right_button);
|
||||
// Don't send button status if there's no change since last time
|
||||
if (button_change){
|
||||
Mouse.set_buttons(left_button, 0, right_button); // send button status over USB
|
||||
}
|
||||
old_left_button = left_button; // remember button status for the next cycle
|
||||
old_right_button = right_button;
|
||||
//
|
||||
// **************************************End of trackpoint routine***********************************
|
||||
//
|
||||
delay(30); // wait 30ms before repeating next polling cycle
|
||||
}
|
||||
Loading…
Reference in a new issue